Spartan 3 ls1 NB output

So i dont really have the room to put in another o2 bung so i want to use the factory bung on the passanger bank.
Problem is when i look at the PCM pinout there is 2 wires high and low signal
Now that kind of has me screwed
Has anyome used the NB output on a LS1 with a 12200411 PCM

I do not know specifically about your ECU, my best guess is that the high signal should be connected to the simulated narrowband output of Spartan 3. Most likely the low signal does not have to be connected, if it does need to be connected then try connecting it to ground.